Track which apps the user has re-ordered on the NTP.

chrome/browser/dom_ui/app_launcher_handler.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/dom_ui/app_launcher_handler.h"
 
 #include <string>
 #include <vector>
 
 #include "base/metrics/histogram.h"
@@ skipping 406 matching lines @@
   CHECK(extension);
 
   Browser* browser = BrowserList::GetLastActive();
   if (!browser)
     return;
   browser->window()->ShowCreateChromeAppShortcutsDialog(
       browser->profile(), extension);
 }
 
 void AppLauncherHandler::HandleReorderApps(const ListValue* args) {
+  CHECK(args->GetSize() == 2);
+
+  std::string dragged_app_id;
+  ListValue* app_order;
+  CHECK(args->GetString(0, &dragged_app_id));
+  CHECK(args->GetList(1, &app_order));
+
   std::vector<std::string> extension_ids;
-  for (size_t i = 0; i < args->GetSize(); ++i) {
+  for (size_t i = 0; i < app_order->GetSize(); ++i) {
     std::string value;
-    if (args->GetString(i, &value))
+    if (app_order->GetString(i, &value))
       extension_ids.push_back(value);
   }
 
+  extensions_service_->extension_prefs()->SetAppDraggedByUser(dragged_app_id);
   extensions_service_->extension_prefs()->SetAppLauncherOrder(extension_ids);
 }
 
 // static
 void AppLauncherHandler::RecordWebStoreLaunch(bool promo_active) {
   UMA_HISTOGRAM_ENUMERATION(extension_misc::kAppLaunchHistogram,
                             extension_misc::APP_LAUNCH_NTP_WEBSTORE,
                             extension_misc::APP_LAUNCH_BUCKET_BOUNDARY);
 
   if (!promo_active) return;
@@ skipping 60 matching lines @@
 
 void AppLauncherHandler::UninstallDefaultApps() {
   DefaultApps* default_apps = extensions_service_->default_apps();
   const ExtensionIdSet& app_ids = default_apps->default_apps();
   for (ExtensionIdSet::const_iterator iter = app_ids.begin();
        iter != app_ids.end(); ++iter) {
     if (extensions_service_->GetExtensionById(*iter, true))
       extensions_service_->UninstallExtension(*iter, false);
   }
 }